<template>
  <div class="xtx-goods-page" v-if="goods">
    <div class="container">
      <!-- 面包屑 -->
      <XtxBread>
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <XtxBreadItem
          v-if="goods && goods.categories"
          :to="`/category/${goods.categories[1].id}`"
          >{{ goods.categories[1].name }}</XtxBreadItem
        >
        <XtxBreadItem
          v-if="goods && goods.categories"
          :to="`/category/sub/${goods.categories[0].id}`"
        >
          {{ goods.categories[0].name }}</XtxBreadItem
        >
        <XtxBreadItem v-if="goods">{{ goods.name }}</XtxBreadItem>
      </XtxBread>
      <!-- 商品信息 -->
      <div class="goods-info">
        <div class="media">
          <GoodsImage :images="goods.mainPictures"></GoodsImage>
          <GoodsSales></GoodsSales>
        </div>
        <div class="spec">
          <GoodName :goods="goods"></GoodName>
          <!-- skuId="300078204" -->
          <GoodsSku :goods="goods" @change="changeSku"></GoodsSku>
          <XtxNumbox
            label="数量"
            v-model="num"
            :max="goods.inventory"
            min="1"
          ></XtxNumbox>
          <XtxButton
            size="middle"
            type="primary"
            style="margin-top: 20px; margin-left: 60px"
            @click="insertCart"
            >加入购物车</XtxButton
          >
        </div>
      </div>
      <!-- 商品推荐 -->
      <GoodsRelevant />
      <!-- 商品详情 -->
      <div class="goods-footer">
        <div class="goods-article">
          <!-- 商品+评价 -->
          <GoodsTabs></GoodsTabs>
          <!-- 注意事项 -->
          <div class="goods-warn">
            <GoodsWarn></GoodsWarn>
          </div>
        </div>
        <!-- 24热榜+专题推荐 -->
        <div class="goods-aside">
          <GoodsHot type="1"></GoodsHot>
          <GoodsHot type="2"></GoodsHot>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import GoodsRelevant from './components/goods-relevant'
import GoodsImage from './components/goods-image'
import GoodsSales from './components/goods-sales.vue'
import GoodName from './components/goods-name.vue'
import GoodsSku from './components/goods-sku.vue'
import GoodsTabs from './components/goods-tabs.vue'
import GoodsHot from './components/goods-hot.vue'
import GoodsWarn from './components/goods-warn.vue'
import { nextTick, provide, ref, watch } from 'vue'
import { findGoods } from '@/api/product'
import { useRoute } from 'vue-router'
import { useStore } from 'vuex'
import Message from '@/components/library/Message'
export default {
  name: 'XtxGoodsPage',
  components: { GoodsRelevant, GoodsImage, GoodsSales, GoodName, GoodsSku, GoodsTabs, GoodsHot, GoodsWarn },
  setup () {
    // 1. 获取商品详情,进行渲染
    const goods = useGoods()
    const changeSku = (sku) => {
      // 修改商品现价原价库存信息
      if (sku.skuId) {
        goods.value.price = sku.price
        goods.value.oldPrice = sku.oldPrice
        goods.value.inventory = sku.inventory
      }
      // 记录选择后的sku 可能有数据可能没有数据
      currSku.value = sku
      // console.log(sku)
    }
    // 提供goods数据给后代组件使用
    provide('goods', goods)
    // 选择的数量
    const num = ref(1)
    // 加入购物车
    const store = useStore()
    const currSku = ref(null)
    const insertCart = () => {
      // 需要哪些字段的约定 必须和客户端保持一致
      // id,skuId,name,attrsText,picture,price,nowPrice,selected,stock,count,isEffective
      // 判断规格是否完整
      if (currSku.value && currSku.value.skuId) {
        const { skuId, specsText: attrsText, inventory: stock } = currSku.value
        const { id, name, price, mainPictures } = goods.value
        store.dispatch('cart/insertCart', {
          skuId,
          attrsText,
          stock,
          id,
          name,
          price,
          nowPrice: price,
          picture: mainPictures[0],
          selected: true,
          isEffective: true,
          count: num.value
        }).then(() => {
          Message({ type: 'warn', text: '加入成功' })
        })
      } else {
        Message({ type: 'warn', text: '请选择完整规格' })
      }
    }
    return { goods, changeSku, num, insertCart }
  }
}
// 获取商品详情
const useGoods = () => {
  // 出现路由地址的商品id出现变化 但是不会初始化组件
  const goods = ref(null)
  const route = useRoute()
  watch(() => route.params.id, (newValue) => {
    if (newValue && `/product/${newValue}` === route.path) {
      findGoods(route.params.id).then(data => {
        // console.log(data)
        // 让商品数据为空 使用v-if组件可以销毁和创建
        goods.value = null
        // 单独只改不会影响组件 nextTick 让上一步代码生效
        nextTick(() => {
          goods.value = data.result
        })
      })
    }
  }, {
    immediate: true
  })

  return goods
}
</script>

<style scoped lang='less'>
.goods-info {
  min-height: 600px;
  background: #fff;
  display: flex;
  .media {
    width: 580px;
    height: 600px;
    padding: 30px 50px;
  }
  .spec {
    flex: 1;
    padding: 30px 30px 30px 0;
  }
}
.goods-footer {
  display: flex;
  margin-top: 20px;
  .goods-article {
    width: 940px;
    margin-right: 20px;
  }
  .goods-aside {
    width: 280px;
    min-height: 1000px;
  }
}
.goods-tabs {
  min-height: 600px;
  background: #fff;
}
.goods-warn {
  min-height: 600px;
  background: #fff;
  margin-top: 20px;
}
</style>
